Indeed. And you cannot coach speed, either.
Not the same type of thing, just something my high school head coach used to say over and over and your comment reminded me of it.
If you can't appreciate the pure beauty of the violin after hearing this, something's wrong with your ears.
Or you can get raw with these strings.
How about this gamechanger from America's Got Talent (which they SHOULD have won).
Either way, the violin is sweet yet lethal.
Do it!
As a racewalk and running coach I have a small quibble. You cannot coach speed that folks don't have but you can help them find the speed they do have. Very few people have a 2:15 marathon in them, but a surprisingly large number of have a 4:00 marathon and settle for a lesser performance.
Translating that to football I suggest the correct strength training, stretching, agility drills and other techniques can trim a hundredth or two of a second from a run, helping create a missed tackle.